Evolution of title of long ACL papers. Each column shows terms distinctive a range. Size indicates frequency; order characteristicness.

1979-1982	1982-1985	1985-1987	1987-1990	1990-1993	1993-1996	1996-1999	1999-2003	2003-2006	2006-2010	2010-2014	2014-2017	2017-2022
natural	natural	grammars	grammar	based	discourse	statistical	statistical	using	web	translation	neural	transformer
issues	parsing	natural	interpretation	context	model	information	machine	statistical	statistical machine translation	joint	embeddings	bert
parsing	syntactic	language	parsing	plan	information	automatic	using	sense	translation	domain	word	dataset
on the	grammar	natural language	grammars	grammar	grammars	based	grammars	discriminative	dependency	semantic	machine translation	neural
processing	computational	english	discourse	lexical	parsing	using	parsing	learning	learning	model	learning	graph
discourse	semantics	analysis	computational	using	based	lexical	text	information	classification	using	sentiment	shot
systems	machine	grammar	treatment	understanding	automatic	speech	answering	speech	using	dependency	embedding	pre
natural language	natural language	computational	reference	free	generation	disambiguation	based	models	unsupervised	word	networks	adversarial
computational	processing	machine	unification - based	semantic	grammar	tagging	methods	disambiguation	automatic	machine translation	deep	language models
knowledge	knowledge	method for	tree	word	using	grammars	extraction	extraction	supervised	models	neural network	multi